diff --git a/lib/docs/main.js b/lib/docs/main.js
index 4e78b760b3..befa858304 100644
--- a/lib/docs/main.js
+++ b/lib/docs/main.js
@@ -1133,13 +1133,13 @@ var zigAnalysis;
                     let arrayObj = /** @type {ArrayType} */ (typeObj);
                     let name = "[";
                     let lenName = exprName(arrayObj.len, opts);
-                    let sentinel = arrayObj.sentinel !== null ? ":"+arrayObj.sentinel : "";
+                    let sentinel = arrayObj.sentinel ? ":0" : "";
 
                     if (opts.wantHtml) {
                       name +=
                         '<span class="tok-number">' + lenName + sentinel + "</span>";
                     } else {
-                      name += lenName;
+                      name += lenName + sentinel;
                     }
                     name += "]";
                     name += exprName(arrayObj.child, opts);
@@ -1150,6 +1150,7 @@ var zigAnalysis;
                   case typeKinds.Pointer:
                   {
                       let ptrObj = /** @type {PointerType} */(typeObj);
+                      let sentinel = ptrObj.sentinel ? ":0" : "";
                       let name = "";
                       switch (ptrObj.size) {
                           default:
@@ -1158,13 +1159,19 @@ var zigAnalysis;
                               name += "*";
                               break;
                           case pointerSizeEnum.Many:
-                              name += "[*]";
+                              name += "[*";
+                              name += sentinel;
+                              name += "]";
                               break;
                           case pointerSizeEnum.Slice:
-                              name += "[]";
+                              name += "[";
+                              name += sentinel;
+                              name += "]";
                               break;
                           case pointerSizeEnum.C:
-                              name += "[*c]";
+                              name += "[*c";
+                              name += sentinel;
+                              name += "]";
                               break;
                       }
                       if (ptrObj['const']) {
diff --git a/src/Autodoc.zig b/src/Autodoc.zig
index 50500412e2..efae96b3bb 100644
--- a/src/Autodoc.zig
+++ b/src/Autodoc.zig
@@ -383,12 +383,12 @@ const DocData = struct {
         Pointer: struct {
             size: std.builtin.TypeInfo.Pointer.Size,
             child: Expr,
-            sentinel: ?usize = null,
+            sentinel: bool = false,
         },
         Array: struct {
             len: Expr,
             child: Expr,
-            sentinel: ?usize = null,
+            sentinel: bool = false,
         },
         Struct: struct {
             name: []const u8,
@@ -767,7 +767,7 @@ fn walkInstruction(
                     .Pointer = .{
                         .size = .One,
                         .child = .{ .type = arrTypeId },
-                        .sentinel = 0,
+                        .sentinel = true,
                         // TODO: add sentinel!
                     },
                 });
@@ -851,7 +851,7 @@ fn walkInstruction(
             const ptr = data[inst_index].ptr_type;
             const extra = file.zir.extraData(Zir.Inst.PtrType, ptr.payload_index);
 
-            const sentinel: ?usize = if (ptr.flags.has_sentinel) 0 else null;
+            const sentinel: bool = if (ptr.flags.has_sentinel) true else false;
 
             const type_slot_index = self.types.items.len;
             const elem_type_ref = try self.walkRef(
@@ -903,7 +903,7 @@ fn walkInstruction(
                 .Array = .{
                     .len = len.expr,
                     .child = elem_type.expr,
-                    .sentinel = 0,
+                    .sentinel = true,
                 },
             });
             return DocData.WalkResult{
@@ -982,7 +982,7 @@ fn walkInstruction(
                         .value = operands.len,
                         .negated = false,
                     },
-                }, .child = array_type.?, .sentinel = 0 },
+                }, .child = array_type.?, .sentinel = true },
             });
 
             return DocData.WalkResult{
@@ -1090,7 +1090,7 @@ fn walkInstruction(
                         .value = operands.len,
                         .negated = false,
                     },
-                }, .child = array_type.?, .sentinel = 0 },
+                }, .child = array_type.?, .sentinel = true },
             });
 
             return DocData.WalkResult{
@@ -1312,6 +1312,7 @@ fn walkInstruction(
             try self.types.append(self.arena, .{
                 .Int = .{ .name = name },
             });
+
             return DocData.WalkResult{
                 .typeRef = .{ .type = @enumToInt(Ref.type_type) },
                 .expr = .{ .type = self.types.items.len - 1 },