diff --git a/docs/voices.md b/docs/voices.md
index 0772e852..bb16c752 100644
--- a/docs/voices.md
+++ b/docs/voices.md
@@ -25,6 +25,7 @@
   - [dictionary](#dictionary)
   - [dictrules](#dictrules)
   - [replace](#replace)
+  - [stressRule](#stressrule)
   - [stressLength](#stresslength)
   - [stressAdd](#stressadd)
   - [stressAmp](#stressamp)
@@ -372,6 +373,20 @@ e.g.
 The phoneme mnemonics can be defined for each language, but some are
 listed in [Phonemes](phonemes.md).
 
+### stressRule
+
+	stressRule <4 integer values>
+
+Four integer parameters. These correspond to:
+
+1. langopts->stress_rule (values in translate.h)
+2. langopts->stress_flags
+3. langopts->unstressed_wd1 (stress for $u word of 1 syllable)
+4. langopts->unstressed_wd2 (stress for $u word of >1 syllable) 
+
+If a value is not given, it defaults to zero. For example:
+"stressRule 2" is equal to "stressRule 2 0 0 0"
+
 ### stressLength
 
 	stressLength <8 integer values>
diff --git a/espeak-ng-data/lang/azc/nci b/espeak-ng-data/lang/azc/nci
index e2de619f..f1896379 100644
--- a/espeak-ng-data/lang/azc/nci
+++ b/espeak-ng-data/lang/azc/nci
@@ -2,5 +2,5 @@ name Nahuatl (Classical)
 language nci
 
 intonation 3
-stressrule 2
+stressRule 2
 stressLength  190  190  200  200  0  0  220  240
diff --git a/espeak-ng-data/lang/inc/ur b/espeak-ng-data/lang/inc/ur
index 4071ac56..16e54695 100644
--- a/espeak-ng-data/lang/inc/ur
+++ b/espeak-ng-data/lang/inc/ur
@@ -3,5 +3,5 @@ language ur
 maintainer Ejaz Shah <eashah67@gmail.com>
 status testing
 
-stressrule 6
+stressRule 6
 
diff --git a/espeak-ng-data/lang/itc/la b/espeak-ng-data/lang/itc/la
index c6e019ab..cd1093e5 100644
--- a/espeak-ng-data/lang/itc/la
+++ b/espeak-ng-data/lang/itc/la
@@ -1,6 +1,6 @@
 name Latin
 language la
-stressrule 2 33 0 2
+stressRule 2 33 0 2
 // rule=penultimate
 // flags=0100001 (no automatic secondary stress + don't stres monosyllables)
 // unstressed_wd1=0
diff --git a/src/libespeak-ng/voices.c b/src/libespeak-ng/voices.c
index 2b551dcc..b7bdc9e7 100644
--- a/src/libespeak-ng/voices.c
+++ b/src/libespeak-ng/voices.c
@@ -142,7 +142,7 @@ static MNEM_TAB keyword_tab[] = {
 	{ "intonation",   V_INTONATION },
 	{ "tunes",        V_TUNES },
 	{ "dictrules",    V_DICTRULES },
-	{ "stressrule",   V_STRESSRULE },
+	{ "stressRule",   V_STRESSRULE },
 	{ "stressopt",    V_STRESSOPT },
 	{ "replace",      V_REPLACE },
 	{ "words",        V_WORDGAP },