diff --git a/Lib/json/__init__.py b/Lib/json/__init__.py
index ccbe9f4..d3b8b0b 100644
--- a/Lib/json/__init__.py
+++ b/Lib/json/__init__.py
@@ -95,7 +95,7 @@
         "json": "obj"
     }
     $ echo '{ 1.2:3.4}' | python -m json.tool
-    Expecting property name: line 1 column 2 (char 2)
+    Expecting property name enclosed in double quotes: line 1 column 2 (char 2)
 """
 __version__ = '2.0.9'
 __all__ = [
diff --git a/Lib/json/decoder.py b/Lib/json/decoder.py
index 1f2da72..7e2c68c 100644
--- a/Lib/json/decoder.py
+++ b/Lib/json/decoder.py
@@ -169,7 +169,8 @@
                 pairs = object_hook(pairs)
             return pairs, end + 1
         elif nextchar != '"':
-            raise ValueError(errmsg("Expecting property name", s, end))
+            raise ValueError(errmsg(
+                "Expecting property name enclosed in double quotes", s, end))
     end += 1
     while True:
         key, end = scanstring(s, end, encoding, strict)
@@ -179,8 +180,7 @@
         if s[end:end + 1] != ':':
             end = _w(s, end).end()
             if s[end:end + 1] != ':':
-                raise ValueError(errmsg("Expecting : delimiter", s, end))
-
+                raise ValueError(errmsg("Expecting ':' delimiter", s, end))
         end += 1
 
         try:
@@ -209,7 +209,7 @@
         if nextchar == '}':
             break
         elif nextchar != ',':
-            raise ValueError(errmsg("Expecting , delimiter", s, end - 1))
+            raise ValueError(errmsg("Expecting ',' delimiter", s, end - 1))
 
         try:
             nextchar = s[end]
@@ -224,8 +224,8 @@
 
         end += 1
         if nextchar != '"':
-            raise ValueError(errmsg("Expecting property name", s, end - 1))
-
+            raise ValueError(errmsg(
+                "Expecting property name enclosed in double quotes", s, end - 1))
     if object_pairs_hook is not None:
         result = object_pairs_hook(pairs)
         return result, end
@@ -259,8 +259,7 @@
         if nextchar == ']':
             break
         elif nextchar != ',':
-            raise ValueError(errmsg("Expecting , delimiter", s, end))
-
+            raise ValueError(errmsg("Expecting ',' delimiter", s, end))
         try:
             if s[end] in _ws:
                 end += 1
diff --git a/Lib/json/tool.py b/Lib/json/tool.py
index c37bb77..b2c786d 100644
--- a/Lib/json/tool.py
+++ b/Lib/json/tool.py
@@ -7,7 +7,7 @@
         "json": "obj"
     }
     $ echo '{ 1.2:3.4}' | python -m json.tool
-    Expecting property name: line 1 column 2 (char 2)
+    Expecting property name enclosed in double quotes: line 1 column 2 (char 2)
 
 """
 import sys