Fix instruction

diff --git a/doc/build-ubuntu.txt b/doc/build-ubuntu.txt
index d2ebf0b..87065df 100644 (file)
--- a/doc/build-ubuntu.txt
+++ b/doc/build-ubuntu.txt
@@ -22,7 +22,7 @@ Configure build files:
 
 You may specify BDB library path, if necessary:
 
-    ```cmake -DBerkeleyDB_LIBS=/usr/lib/aarch64-linux-gnu/ -DUSE_LEVELDB ../novacoin```
+    ```cmake -DBerkeleyDB_LIBS=/usr/lib/aarch64-linux-gnu/ -DUSE_LEVELDB=1 ../novacoin```
 
 Compile:
 
@@ -40,7 +40,7 @@ Create build directory:
 
 Configure build files:
 
-    ```cmake -DUSE_LEVELDB ../novacoin/src```
+    ```cmake -DUSE_LEVELDB=1 ../novacoin/src```
 
 Compile: