diff --git a/doc/native_protocol_v1.spec b/doc/native_protocol_v1.spec
index 41146f97da..0329765f44 100644
--- a/doc/native_protocol_v1.spec
+++ b/doc/native_protocol_v1.spec
@@ -683,8 +683,8 @@ Table of Contents
                      the exception.
                 <received> is an [int] representing the number of nodes having
                            acknowledged the request.
-                <blockfor> is the number of replica whose acknowledgement is
-                           required to achieve <cl>.
+                <blockfor> is an [int] representing the number of replica whose
+                           acknowledgement is required to achieve <cl>.
                 <writeType> is a [string] that describe the type of the write
                             that timeouted. The value of that string can be one
                             of:
@@ -709,9 +709,9 @@ Table of Contents
                      the exception.
                 <received> is an [int] representing the number of nodes having
                            answered the request.
-                <blockfor> is the number of replica whose response is
-                           required to achieve <cl>. Please note that it is
-                           possible to have <received> >= <blockfor> if
+                <blockfor> is an [int] representing the number of replicas whose
+                           response is required to achieve <cl>. Please note that it
+                           is possible to have <received> >= <blockfor> if
                            <data_present> is false. And also in the (unlikely)
                            case were <cl> is achieved but the coordinator node
                            timeout while waiting for read-repair
diff --git a/doc/native_protocol_v2.spec b/doc/native_protocol_v2.spec
index 584ae2f6f5..449396635f 100644
--- a/doc/native_protocol_v2.spec
+++ b/doc/native_protocol_v2.spec
@@ -867,8 +867,8 @@ Table of Contents
                      the exception.
                 <received> is an [int] representing the number of nodes having
                            acknowledged the request.
-                <blockfor> is the number of replica whose acknowledgement is
-                           required to achieve <cl>.
+                <blockfor> is an [int] representing the number of replica whose
+                           acknowledgement is required to achieve <cl>.
                 <writeType> is a [string] that describe the type of the write
                             that timeouted. The value of that string can be one
                             of:
@@ -893,9 +893,9 @@ Table of Contents
                      the exception.
                 <received> is an [int] representing the number of nodes having
                            answered the request.
-                <blockfor> is the number of replica whose response is
-                           required to achieve <cl>. Please note that it is
-                           possible to have <received> >= <blockfor> if
+                <blockfor> is an [int] representing the number of replica whose
+                           response is required to achieve <cl>. Please note that it
+                           is possible to have <received> >= <blockfor> if
                            <data_present> is false. And also in the (unlikely)
                            case were <cl> is achieved but the coordinator node
                            timeout while waiting for read-repair