diff --git a/spirv_cross.cpp b/spirv_cross.cpp
index abffe386..b6529141 100644
--- a/spirv_cross.cpp
+++ b/spirv_cross.cpp
@@ -890,7 +890,7 @@ uint32_t Compiler::get_member_decoration(uint32_t id, uint32_t index, Decoration
 	case DecorationSpecId:
 		return dec.spec_id;
 	default:
-		return 0;
+		return 1;
 	}
 }
 
@@ -1018,11 +1018,8 @@ uint32_t Compiler::get_decoration(uint32_t id, Decoration decoration) const
 		return dec.input_attachment;
 	case DecorationSpecId:
 		return dec.spec_id;
-	case DecorationNonWritable:
-	case DecorationNonReadable:
-		return 1;
 	default:
-		return 0;
+		return 1;
 	}
 }
 
diff --git a/spirv_cross.hpp b/spirv_cross.hpp
index 1736368f..ec2bfc30 100644
--- a/spirv_cross.hpp
+++ b/spirv_cross.hpp
@@ -138,8 +138,10 @@ public:
 	uint64_t get_decoration_mask(uint32_t id) const;
 
 	// Gets the value for decorations which take arguments.
+	// If the decoration is a boolean (i.e. spv::DecorationNonWritable),
+	// 1 will be returned.
 	// If decoration doesn't exist or decoration is not recognized,
-	// 0 will be returned.
+	// 0 will be returned. 
 	uint32_t get_decoration(uint32_t id, spv::Decoration decoration) const;
 
 	// Removes the decoration for a an ID.