diff --git a/zsh_completions.go b/zsh_completions.go
index 4705a90..59f5531 100644
--- a/zsh_completions.go
+++ b/zsh_completions.go
@@ -139,7 +139,7 @@ func genFlagEntryForSingleOptionFlag(f *pflag.Flag) string {
 	}
 	extras = genZshFlagEntryExtras(f)
 
-	return fmt.Sprintf(`'%s%s[%s]%s'`, multiMark, option, f.Usage, extras)
+	return fmt.Sprintf(`'%s%s[%s]%s'`, multiMark, option, quoteDescription(f.Usage), extras)
 }
 
 func genFlagEntryForMultiOptionFlag(f *pflag.Flag) string {
@@ -154,7 +154,7 @@ func genFlagEntryForMultiOptionFlag(f *pflag.Flag) string {
 		parenMultiMark, f.Shorthand, parenMultiMark, f.Name, curlyMultiMark, f.Shorthand, curlyMultiMark, f.Name)
 	extras = genZshFlagEntryExtras(f)
 
-	return fmt.Sprintf(`%s'[%s]%s'`, options, f.Usage, extras)
+	return fmt.Sprintf(`%s'[%s]%s'`, options, quoteDescription(f.Usage), extras)
 }
 
 func genZshFlagEntryExtras(f *pflag.Flag) string {
@@ -177,3 +177,7 @@ func flagCouldBeSpecifiedMoreThenOnce(f *pflag.Flag) bool {
 	return strings.Contains(f.Value.Type(), "Slice") ||
 		strings.Contains(f.Value.Type(), "Array")
 }
+
+func quoteDescription(s string) string {
+	return strings.Replace(s, "'", `'\''`, -1)
+}
diff --git a/zsh_completions_test.go b/zsh_completions_test.go
index 22a66d6..6788797 100644
--- a/zsh_completions_test.go
+++ b/zsh_completions_test.go
@@ -146,6 +146,17 @@ func TestGenZshCompletion(t *testing.T) {
 				"function _root {",
 			},
 		},
+		{
+			name: "flag description with single quote (') shouldn't break quotes in completion file",
+			root: func() *Command {
+				r := genTestCommand("root", true)
+				r.Flags().Bool("private", false, "Don't show public info")
+				return r
+			}(),
+			expectedExpressions: []string{
+				`--private\[Don'\\''t show public info]`,
+			},
+		},
 	}
 
 	for _, tc := range tcs {