diff --git a/src/main/asciidoc/_chapters/architecture.adoc b/src/main/asciidoc/_chapters/architecture.adoc
index 5dc244b4337..0236d81eeea 100644
--- a/src/main/asciidoc/_chapters/architecture.adoc
+++ b/src/main/asciidoc/_chapters/architecture.adoc
@@ -682,7 +682,7 @@ The last value (99%) is the default acceptable loading factor in the LRU cache a
 The reason it is included in this equation is that it would be unrealistic to say that it is possible to use 100% of the available memory since this would make the process blocking from the point where it loads new blocks.
 Here are some examples:
 
-* One region server with the default heap size (1 GB) and the default block cache size will have 253 MB of block cache available.
+* One region server with the heap size set to 1 GB and the default block cache size will have 253 MB of block cache available.
 * 20 region servers with the heap size set to 8 GB and a default block cache size will have 39.6 of block cache.
 * 100 region servers with the heap size set to 24 GB and a block cache size of 0.5 will have about 1.16 TB of block cache.
 
diff --git a/src/main/asciidoc/_chapters/configuration.adoc b/src/main/asciidoc/_chapters/configuration.adoc
index 6f8858d50cb..a5430eb20f3 100644
--- a/src/main/asciidoc/_chapters/configuration.adoc
+++ b/src/main/asciidoc/_chapters/configuration.adoc
@@ -708,8 +708,8 @@ The following lines in the _hbase-env.sh_ file show how to set the `JAVA_HOME` e
 # The java implementation to use.
 export JAVA_HOME=/usr/java/jdk1.7.0/
 
-# The maximum amount of heap to use, in MB. Default is 1000.
-export HBASE_HEAPSIZE=4096
+# The maximum amount of heap to use. Default is left to JVM default.
+export HBASE_HEAPSIZE=4G
 ----
 
 Use +rsync+ to copy the content of the _conf_ directory to all nodes of the cluster.