diff --git a/docs/specifications/hdf5.Rmd b/docs/specifications/hdf5.Rmd
index cbdab37..b4c3cb5 100644
--- a/docs/specifications/hdf5.Rmd
+++ b/docs/specifications/hdf5.Rmd
@@ -103,6 +103,8 @@ if (.version == package_version("1.0")) {
   where the strings are in the `YYYY-MM-DD` format or are equal to a missing placeholder value.
 - `"date-time"`: a HDF5 string datatype that can be represented by a UTF-8 encoded string,
   where the strings are Internet Date/Time format, or are equal to a missing placeholder value.')
+} else {
+    cat("  <!--- -->")
 }
 ```
 
diff --git a/docs/specifications/json.Rmd b/docs/specifications/json.Rmd
index 9a201b6..83c3312 100644
--- a/docs/specifications/json.Rmd
+++ b/docs/specifications/json.Rmd
@@ -73,6 +73,8 @@ The contents of `values` is subject to some constraints:
 ```{r, echo=FALSE, results="asis"}
 if (.version == package_version("1.0")) {
     cat("  Missing integers may also be represented by the special value -2147483648.")
+} else {
+    cat("  <!--- -->")
 }
 ```
 - `"boolean"`: values should be JSON booleans or `null` (for missing values).
@@ -111,6 +113,8 @@ if (.version == package_version("1.0")) {
 ```{r, echo=FALSE, results="asis"}
 if (.version == package_version("1.0")) {
     cat("  Missing integers may also be represented by the special value -2147483648.")
+} else {
+    cat("  <!--- -->")
 }
 ```
 - `levels`, an array of unique strings containing the levels for the indices in `values`.
@@ -119,6 +123,8 @@ if (.version == package_version("1.0")) {
 if (.version >= package_version("1.1")) {
     cat("- (optional) `ordered`, a boolean indicating whether to assume that the levels are ordered.
   If absent, levels are assumed to be non-ordered.")
+} else {
+    cat(" <!--- -->")
 }
 ```